Track devserver.sh and finish the tower -> beacon rename

scripts/ was caught by a stray .gitignore entry, so the npm start/stop
helpers pointed at a file fresh clones never got. Also sweep the last
tower-* references out of comments, compose and the map test fixture.

scripts/devserver.sh

@@ -0,0 +1,92 @@
+#!/usr/bin/env bash
+# Start/stop helper for the beacon-web Vite dev server.
+#
+# Usage:
+#   scripts/devserver.sh start      # launch on a fixed port (background)
+#   scripts/devserver.sh stop       # stop the server this script started
+#   scripts/devserver.sh restart    # stop then start
+#   scripts/devserver.sh status     # is it running? on what URL?
+#   scripts/devserver.sh stop-all   # kill ALL stray vite processes (cleanup)
+#
+# Port defaults to 5173; override with BEACON_WEB_PORT=NNNN.
+set -euo pipefail
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+PORT="${BEACON_WEB_PORT:-5173}"
+RUNTIME_DIR="$DIR/.scripts"
+PID_FILE="$RUNTIME_DIR/devserver.pid"
+LOG_FILE="$RUNTIME_DIR/devserver.log"
+VITE_BIN="$DIR/node_modules/vite/bin/vite.js"
+
+is_alive() { [ -f "$PID_FILE" ] && kill -0 "$(cat "$PID_FILE")" 2>/dev/null; }
+
+start() {
+  if is_alive; then
+    echo "dev server already running (pid $(cat "$PID_FILE")) — $(url)"
+    return 0
+  fi
+  if [ ! -f "$VITE_BIN" ]; then
+    echo "vite not found at $VITE_BIN — run 'npm install' first" >&2
+    exit 1
+  fi
+  mkdir -p "$RUNTIME_DIR"
+  # --strictPort: fail loudly if the port is taken instead of silently drifting.
+  nohup node "$VITE_BIN" --port "$PORT" --strictPort >"$LOG_FILE" 2>&1 &
+  echo $! >"$PID_FILE"
+  # Give Vite a moment to bind (or fail) so status output is accurate.
+  for _ in $(seq 1 20); do
+    grep -q "Local:" "$LOG_FILE" 2>/dev/null && break
+    is_alive || { echo "dev server failed to start — see $LOG_FILE" >&2; rm -f "$PID_FILE"; tail -n 5 "$LOG_FILE" >&2; exit 1; }
+    sleep 0.25
+  done
+  echo "dev server started (pid $(cat "$PID_FILE")) — $(url)"
+}
+
+stop() {
+  local stopped=0
+  if is_alive; then
+    local pid; pid="$(cat "$PID_FILE")"
+    kill "$pid" 2>/dev/null || true
+    pkill -P "$pid" 2>/dev/null || true   # any children Vite spawned
+    stopped=1
+  fi
+  # Also free the port in case a previous, untracked run is holding it.
+  local port_pids; port_pids="$(lsof -ti "tcp:$PORT" 2>/dev/null || true)"
+  if [ -n "$port_pids" ]; then
+    echo "$port_pids" | xargs kill 2>/dev/null || true
+    stopped=1
+  fi
+  rm -f "$PID_FILE"
+  [ "$stopped" = 1 ] && echo "dev server stopped" || echo "dev server was not running"
+}
+
+status() {
+  if is_alive; then
+    echo "running (pid $(cat "$PID_FILE")) — $(url)"
+  else
+    echo "not running"
+  fi
+}
+
+# Best-effort cleanup of the stale instances that pile up across sessions.
+# Matches any vite launched from THIS project's node_modules (covers both the
+# `.bin/vite` symlink used by `npm run dev` and the resolved `vite/bin/vite.js`
+# used by this script) so it won't touch other projects' servers.
+stop_all() {
+  pkill -f "$DIR/node_modules/.*vite" 2>/dev/null && echo "killed stray beacon-web vite processes" || echo "no stray beacon-web vite processes found"
+  rm -f "$PID_FILE"
+}
+
+# Read the actual URL Vite reported (handles the case where the port differs).
+url() {
+  grep -oE "http://localhost:[0-9]+/?" "$LOG_FILE" 2>/dev/null | head -1 || echo "http://localhost:$PORT/"
+}
+
+case "${1:-}" in
+  start)    start ;;
+  stop)     stop ;;
+  restart)  stop; start ;;
+  status)   status ;;
+  stop-all) stop_all ;;
+  *) echo "usage: $0 {start|stop|restart|status|stop-all}" >&2; exit 2 ;;
+esac